From God to Catherine:
WHEN the soul has passed through the doctrine of Christ crucified, with true love of virtue and hatred of vice, and has arrived at the house of self-knowledge and entered therein, she remains, with her door barred, in watching and constant prayer, separated entirely from the consolations of the world. Why does she thus shut herself in? She does so from fear, knowing her own imperfections, and also from the desire, which she has, of arriving at pure and generous love. And because she sees and knows well that in no other way can she arrive thereat, she waits, with a lively faith for My arrival, through increase of grace in her. How is a lively faith to be recognized? By perseverance in virtue, and by the fact that the soul never turns back for anything, whatever it be, nor rises from holy prayer, for any reason except (note well) for obedience or charity’s sake. For no other reason ought she to leave off prayer, for, during the time ordained for prayer, the devil is wont to arrive in the soul, causing much more conflict and trouble than when the soul is not occupied in prayer. This he does in order that holy prayer may become tedious to the soul, tempting her often with these words: “This prayer avails thee nothing, for thou needest attend to nothing except thy vocal prayers.” He acts thus in order that, becoming wearied and confused in mind, she may abandon the exercise of prayer, which is a weapon with which the soul can defend herself from every adversary, if grasped with the hand of love, by the arm of free choice in the light of the Holy Faith.
KNOW, dearest daughter, how, by humble, continual, and faithful prayer, the soul acquires, with time and perseverance, every virtue. Wherefore should she persevere and never abandon prayer, either through the illusion of the devil or her own fragility, that is to say, either on account of any thought or movement coming from her own body, or of the words of any creature. The devil often places himself upon the tongues of creatures, causing them to chatter nonsensically, with the purpose of preventing the prayer of the soul. All of this she should pass by, by means of the virtue of perseverance. Oh, how sweet and pleasant to that soul and to Me is holy prayer, made in the house of knowledge of self and of Me, opening the eye of the intellect to the light of faith, and the affections to the abundance of My charity, which was made visible to you, through My visible Only-begotten Son, who showed it to you with His blood! Which Blood inebriates the soul and clothes her with the fire of divine charity, giving her the food of the Sacrament [which is placed in the hostelry of the mystical body of the Holy Church] that is to say, the food of the Body and Blood of My Son, wholly God and wholly man, administered to you by the hand of My vicar, who holds the key of the Blood. This is that hostelry, which I mentioned to thee, standing on the Bridge, to provide food and comfort for the travelers and the pilgrims, who pass by the way of the doctrine of My Truth, lest they should faint through weakness. This food strengthens little or much, according to the desire of the recipient, whether he receives sacramentally or virtually.
The enclosed soul should therefore spur herself on with prayer, and when she has arrived at friendly and filial love she does so. Unless the soul keeps to this path, she will always remain tepid and imperfect, and will only love Me and her neighbor in proportion to the pleasure which she finds in My service.